View Crit CSS is a free Chrome add-on developed by Matthias Vogt. It falls under the category of Browsers, specifically Add-ons & Tools. This handy tool allows users to toggle external stylesheets on and off, providing a quick preview of a webpage with only the critical, inline CSS.

With View Crit CSS, users can easily see how a webpage looks before the external CSS has loaded. This can be especially useful for web developers and designers who want to check the visual appearance of a page during the loading process. By using the keyboard shortcuts (default: ctrl+e/cmd+e), users can quickly switch between the full view and the critical CSS view.

By providing a simple and accessible way to toggle external stylesheets, View Crit CSS offers a valuable tool for those working on web development projects. Whether you're fine-tuning the design or troubleshooting loading issues, this add-on can help streamline your workflow.